Add -version option to print program version

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>

2 files changed, 13 insertions, 1 deletions

diff --git a/man/xgamma.man b/man/xgamma.man
index d6662f7..1cb33d1 100644
--- a/man/xgamma.man
+++ b/man/xgamma.man
@@ -23,7 +23,7 @@
 xgamma - Alter a monitor's gamma correction through the X server
 .SH SYNOPSIS
 .B "xgamma"
-[-display \fIdisplay\fP] [-screen \fIscreen\fP] [-quiet]
+[-display \fIdisplay\fP] [-screen \fIscreen\fP] [-quiet] [-version]
 [-gamma f.f | [[-rgamma f.f] [-ggamma f.f] [-bgamma f.f]]]
 .SH DESCRIPTION
 .PP
@@ -62,6 +62,10 @@ Silence the normal output of
 Print out the `Usage:' command syntax summary.
 .PP
 .TP 8
+.B "-version"
+Print out the program version and exit.
+.PP
+.TP 8
 .B "-gamma f.f"
 The gamma correction can either be defined as a single value, or
 separately for the red, green and blue components. This argument
diff --git a/xgamma.c b/xgamma.c
index d58d114..2d1e789 100644
--- a/xgamma.c
+++ b/xgamma.c
@@ -22,6 +22,10 @@
  * Written by David Bateman
  */
 
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
 #include <stdio.h>
 #include <errno.h>
 #include <X11/Xos.h>
@@ -54,6 +58,7 @@ Syntax(const char *errmsg)
              "    -display host:dpy       or -d\n"
              "    -quiet                  or -q\n"
              "    -screen                 or -s\n"
+             "    -version                or -v\n"
              "    -gamma f.f              Gamma Value\n"
              "    -rgamma f.f             Red Gamma Value\n"
              "    -ggamma f.f             Green Gamma Value\n"
@@ -113,6 +118,9 @@ main(int argc, char *argv[])
 	    } else if (isabbreviation ("-quiet", arg, 1)) {
 		quiet = True;
 		continue;
+	    } else if (isabbreviation ("-version", arg, 1)) {
+		puts(PACKAGE_STRING);
+		exit(0);
 	    } else if (isabbreviation ("-screen", arg, 1)) {
 		if (++i >= argc) Syntax ("-screen requires an argument");
 		screen = atoi(argv[i]);